The syntax of the negateExact() method is:
Math.negateExact(num)
Here, negateExact() is a static method. Hence, we are accessing the method using the class name, Math.
negateExact() Parameters
The negateExact() method takes a single parameter.
- num - argument whose sign is to be reversed
Note: The data type of the argument should be either int or long.
negateExact() Return Value
- returns the value after reversing the sign of the specified argument
Example 1: Java Math.negateExact()
class Main {
public static void main(String[] args) {
// create int variables
int a = 65;
int b = -25;
// negateExact() with int arguments
System.out.println(Math.negateExact(a)); // -65
System.out.println(Math.negateExact(b)); // 25
// create long variable
long c = 52336L;
long d = -445636L;
// negateExact() with long arguments
System.out.println(Math.negateExact(c)); // -52336
System.out.println(Math.negateExact(d)); // 445636
}
}
In the above example, we have used the Math.negateExact() method with the int and long variables to reverse the sign of respective variables.
Example 2: Math.negateExact() Throws Exception
The negateExact() method throws an exception if the result of the negation overflows the data type. That is, the result should be within the range of the data type of specified variables.
class Main {
public static void main(String[] args) {
// create a int variable
// minimum int value
int a = -2147483648;
// negateExact() with the int argument
// throws exception
System.out.println(Math.negateExact(a));
}
}
In the above example, the value of a is the minimum int value. Here, the negateExact() method changes the sign of the variable a.
-(a)
=> -(-2147483648)
=> 2147483648 // out of range of int type
Hence, the negateExact() method throws the integer overflow exception.